Can frozen shrimp be eaten when it turns black?
There is no absolute answer. It depends on the specific situation. Many people think that this is due to the bad shrimp, so choose not to eat, in fact, it is not the case, not all black shrimp can not eat.
1. It gets dark before it comes out of the freezing room. That's not fresh. Better not eat it.
2. If it is good before thawing, it will change color and darkness after thawing, which is generally normal. The main reason for shrimp blackening is that the polyphenol oxidase in shrimp body causes tyrosine to produce melanin, while the polyphenol oxidase in shrimp head is more, so the hair of shrimp will be black. After being taken out from the freezing room, the shrimp will be thawed in the freezing room, and the polyphenol oxidase is oxidized, so the shrimp will be blackened.
This kind of shrimp is not particularly fresh, but it is generally irrelevant to eat, but the taste is not as good as the original, not delicious enough. Or for the beauty of the food, it is recommended to remove the head and shell of shrimp and continue to eat.
3. It is normal for shrimp to blacken just after thawing. However, if the shrimp is not eaten in time after thawing and stored for two days, the shrimp is likely to deteriorate. Two days has been a long time, and the summer weather is hot, after dark smell whether it stinks, if the stink means that has deteriorated, do not eat. Seafood should be fresh. It's bad for your health if you keep it like this for a long time.
4. Of course, besides that, you should also identify it. Because frozen shrimp also has shelf life. It is normal to see that the shrimp hair is black, but the meat of the shrimp body is still green-gray. Some shrimp heads are black and the meat of the shrimp body is red, but the meat is still elastic and edible. If the shrimp meat is "black and yellow", there is no elasticity, it must not be eaten. Therefore, it depends not only on the color, but also on the odor, as well as the flexibility of the meat of the shrimp by pressing it with the hand.
How to distinguish whether frozen shrimp is spoiled or not
1. See if the head of the shrimp falls off. If the whole shrimp is relatively complete, the head and tail are closely connected with the body, indicating that the shrimp is relatively fresh. The head of shrimp falls off, head and body, shell and meat are loosely connected, head and tail are easy to fall off or separate, which is not fresh.
2. Cooked and refrigerated shrimp. Look at the color of shrimp head. Shrimp head is very bright, not black, it is good shrimp. And if it's dark, it's not fresh. Red shrimp is cooked with black head, frozen after death, or has deteriorated more severely, this is not necessary.
3. Frozen raw shrimp. Look at the color of shrimp shells. White, blue and white is the best, do not redden, reddish is not fresh.